System for utilizing waste heat of coke



0. BRENDEL SYSTEM FOR U'I ILIZINGWASTE HEAT OF COKE Feb; 27, 1923.

Filed Jan 1. 51, 1.922 2 sheets-sheet 1 (in en for fis'ar Brena e! 2? Feb. 27, 1923: 1,446,960

- o. BRENDEL SYSTEM FOR UTILIZING WASTE HEAT OF COKE File-d Jan. 51, 1922 2 sheets-sheet 2 [Mi/788868. wave/22 w 2% m 08%.? firena el Fatented Feb. 2?, i223.

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C'SKAR BRENDEL, OF NUREMBERG, GERMANY.

SYSTEM FOR UTILIZING WASTE HEAT F COKE.

Application filed January 31, 1922.

T 0 all whom it may concern Be it known that I, OSKAR BRENDEL, residing at Nuremberg, Germany, have invented certain new and useful Improvements in Systems for Utilizing the Waste Heat of Coke, for which I have filed applications in Germany, May 1 1. 1920; Belgium,

Nov. 19, 1921; Switzerland, Got. 28, 1921; France, Nov. 15, 1921, and in England, Nov.

'17, 1921, and of which the following is a I specification.

My invention relates to improvements in the method of and system for regenerating the heat from heated coke being cooled, and more particularly in the method in which the coke is cooled by means of a current of an inert gas supplied to a heat consuming apparatus such as a steam boiler for transmitting thereto the heat taken from the coke. One of the objects of the improvements is to provide a method and a system in which the heat isput to use to a higher degree than in systems now in use. With this object in view my invention consists in passing'the current of inert gas through the mass of hot coke and successively supplying the same to parts of the heat consuming device which are to be heated at gradually diminishing temperaturesfl In the practice of the invention I prefer to divide the current of gas into sections each of which flows to a part of the heat consuming apparatus and successively to pass the coke in a thin layer through said sections,.so that the section of the current to which the coke is first exposed is heated at the highest temperature, while the temperature of' the following sections is gradually reduced as compared to that of the first section. Another object of the improvements is to cool the coke in such a way that the lumps of coke are not broken up in an objectionable way. \Vith these and other objects in view my invention consists in the matters to be described hereinafter and particularly pointed out in the appende claims.

In order that the invention be more clearly understood several examples embodying the same have been shown in the accompanying drawings in which the same letters of reference have been used in all the views to indicate corresponding parts. In said drawings,-

Fig. 1, is a diagrammatical sectional view showing my improved system in connection with a steam boiler,

Serial No. 533,127.

Fig. 2, is a similar sectional view showing a modification and taken substantially on the line 2-2 of Fig. at, y i

Fig. 3, is a vertical section taken on the line 3 3 of Fig. 4,

Fig. 4, is a horizontal section line ir-l of Fig. 2, and

Fig. 5, is a sectional view showing a further modification.

In the example shown in Fig. 1' which is designed to regenerate the heat of the coke discharged from a coke oven a by supplying the same to a boiler, my system comprises a travelling elevator or crane truck provided with a coke receptacle 6, a feed chamber (Z for conveying-the coke to a chain grate e, and a steam boiler plant. As shown the said boiler plant consists of a steam boiler 71, a superheater m, and'a preheater or fuel economizer 0. The brick work of the plant is constructed so as to provide a chamber connected with a supply g of a suitable inert gas such as carbon dioxide, nitrogen. waste gas from the heating chamber of acoke oven, or flue gas. a passage or flue 2, wherein the superheater m is located, a passage disposed laterally of the superheater. a passage 2 communicating with the tubes of the economizer 0, and a flue At the discharge end of the grate e the brick work provides a hopper '2' which is preferably closed by a rotary gate 1. For circulating the gas through the boiler I provide a rotary fan or blower 7 which discharges into the pipe g andpreferably communicates through a pipe 9 with the flue p for withiilrawing the inert gas from the boiler flues and again forcing the same through the coke.

The operation of the system shown in Fig. 1 is as follows:

The coke expelled from the oven chamber a into the coke receptacle 1) is conveyed to the boiler apparatus where, whilst still incandescent, it is conveyed into the feed apparatus d of the rate 6.

In the boiler installation the cooling of the coke is carried out by providing that the coke is always encountered by cold inert gas by the gas fan or ventilator f keeping the gas constantly in circulation through the boiler apparatus. The ventilator 7' conveys the cooling gas through the pipe 9 beneath the chain grate e where it is heated in the layer of incandescent coke h and from which it is again conveyed to the separate elements of the boiler simultaneously and.

taken on the in zones according to its temperature. Those gases which pass through the coke in zone ll of the chain grate and which are heated the most take their course over the superheater m then pass on through the actual steam boiler n and thence on the outside of the boiler and along the upper part oi. the preheater 0 to the flue p. The gas which is heated in the zone is of the chain grate takes a similar course. only it is conveyed laterally ot-the super-heater. The gas which passes through zone I of the grate and is comparatively little heated'first flows beneath the preheater 0, heats the latter externally and then passes through its system of tubes back to the fine or passage ,1) after it has given up its heat to the heating surfaces of the preheater. The fan draws the cooled gas from the flue p through the pipe 9 back again and conveys it afresh into a similar course.

The coke which has undergone cooling in passing over' the chain grate e falls into the discharge hopper '2- and after passing through the rotary gate it is sprayed through a nozzle 8 with water and can then be loaded into a trudk t for dispatch.

The boiler installation may of course differ substantially in its construction and so forth from the one shown as an example and herein-before explained without the essential feature of the invention being al-.

tered. F or this reason the arrangements for distributing the coke over the grate, and all other auxiliary apparatus are not further explained. For example, my invention is not limited to the use in connection with a tubular boiler or a boiler in which the I prefer to congas flows through tubes. vey the gas through the fines at high velocity in order that comparatively small heating surfaces may be provided. as is usual in waste heat boilers.

In some cases I pass steam through the coke prior to applying the cooling gas thereto, for the purpose of generating water gas and subjecting the coke to a. prelimi nary cooling process.

In Figs. 2 to 4 I have shown a modification in which the coke from thecoke oven is conveyed to the boiler system in such a way that the lumps are broken up in a less degree than in the system shown in Fig. 1, and in which the loss of heat by radiation of the coke is reduced. With these objects in view the coke cake coming from the coke oven a is forced unbroken into an entirely closed portable case or box 71 The case or box is then conveyed in front of the heat exchanging apparatus. This has a preliminary chamber 0 in which a conveyor band 6 is placed. The coke is moved from the box 6 onto this. conveyor band 6 A slide al located at the other end of the prelimi nary chamber remains at first closed in or der thatthe cooling operation in the chamher 0 may take place continuously without any interruption during the introduction of the coke. l 'VVhen the coke is forced into the preliminary chamber c a gate 11. is closed, gate a and valves r (Fig. l) for the gas admission are opened so that the front chamber also can be utilized for cooling the coke. The conveyor band is divided in two belts e and e the belt e of which has a greaterspeed than the belt a receiving the coke at first. The coke conveyed from the belt c to the belt 0 thereby is broken up in a thinner layer, so that a rapid cooling of the coke in consequence of the reduction in the thickness of the layers is obtained by the loosening and the distributing of the coke cake; lret'erably the belt is operated at larger speed than the belt 1:.

The heated gas in its course to the fan or ventilatoiff. (Figs. 3 and 4) gives oll' its heat to produce steam and hot water in the respective a -iparatus, the cooled gas goes back to the cooling chamber by means of pipes m and 2c}. y

The apparatus shown in Figs. 2.l also admits of a division of the gas current. the gas current of'lower temperature being conveyed directly to a hot water producer 112 avoiding the boileri/r and the super-heater 111- by means ota passage .1', a valve I being pro vided for regulating the quantity of gas supplied to the hot water producer in.

In Fig. 5 I have shown a modification in which the mass of heated coke is made to tra verse the consecutive sectional currents of cooling gas by travelling downwards a slop-- ing grate e As shown the heated sectional currents flow at first each in contact with a part of the boiler tubes 24 whereupon the first sectional current traverses the tubes of the superheater m and finally flows to the rear partpf the main boiler 21 The con-- duit g fromthe fan f is divided into sec-- tions each-containing a regulating valve g controlling the supply of gas to the individual sections.

I wish it to be understood that my invention is not limited to a system in which cooling is efiected exclusively by an inert gas, and that in some cases steam is passed through the coke prior to subjecting the same to the action of the gas. "for generating water gas; Furthermore it will be understood that-the method of regenerating the heat-within a steam boiler or water heater has been shown merely by way of example, and that other heat consuming apparatus may be provided in a similar way. such for exampleas apparatus for heating a blast or'the like.

While in describing the invention refcr constructions shown in the figures, and that various changes may be made in the manner of'carrying out the method and in the gen-- eral arrangement of the system and the con struction of its parts without departing from the inventio I claim:

1. The herein described method of regen crating the heat of heatedcoke by passing a current of an inert gas in contact with the coke, dividing said current into zones 01? difierent temperature and conveying each zone separately to a heat consuming device.

2. The herein described method of regen erating the heat of heated coke by passing a. current of an inert gas in contact with the coke and passing the coke through the gas current, and further dividing said current into zones of different temperature and conveying each zone of the divided current of inert gas separately to a heat consuming device.

3. The herein described method of regenerating the heat of heated coke by passing'a current of an inert gas in contact with the coke, which consists in breaking up the coke into a thin layer and conveying the separated zones of said current, divided corresponding to its temperature, from the coke to difi'erent heat consuming devices.

4. The herein described method of regencrating the heat of heated coke, by passing a current of an inert gas in contact with the heated coke broken up into a thin layer and passing the coke through the gas current, further dividing said current into zones of different temperature and conveying each zone of the divided current of inert gas separately to a heat consuming device.

'5. In a system for regenerating the heat of heated coke, the combination, with means to produce a current of inert gas in contact with said coke, and means to pass the coke through the gas current and to divide this gas current into zones of different temperature, of a plurality of heat consuming de-' vices passed by the separated zones of said gas current.

6. In a system forregenerating the heat of heated coke, the combination, with means to.

produce a current of inert gas in contact with said coke, and means to break upsaid heated coke into a thin layer, means to pass 7. In a system for regenerating the heat of Witnesses into zones of diiferent temperature, of a plurality of heat consuming devices, passed by the separated zones of said gas current.

8. In a syste'mvfor regenerating the heat of heated coke, the combination, with means to produce a current of inert gas and to pass the coke through the gas current,'of a plurality of heat consuming devices, each passed by one of the separated zones of different temperature of the gas, and a chamber adapted to be closed at its inlet and out-let ends, and means to convey the heated coke into said chamber and from said chamber into contact with said current.

9. In a, system for regenerating the heat of heated coke, the combination, with means to produce a current of inert gas and to pass the coke through the gas currents, of a plurality of heat consuming devices, each passed by one "of the separated zones of difl'erent temperature of the gas, and means to convey the heated coke into contact with said cur rent, said means comprising a plurality of elongated conveyers arranged in succession and moving with different velocities.

10. In a system for regenerating the heat of heated coke, the combination, with means to produce a current of inert gas, and to pass the coke through the gas currents, of a plurality of heat consuming devices, each passed by one of the separated zones of different temperature of the gas, andmeans to convey the heated coke into contact with said current, said means comprising a plurality of elongated conveyers arranged in succession inclined so as to have discharge ends higher than the receiving ends and moving with different velocities, 11. In a system'for regenerating-the heat of heated coke, the combination, with means to produce a current of inert gas, and to pass the coke through the gas current, of a plurality of heat consuming devices, each passed by one of the separated zones of different a temperature of the gas, means to regulate said current, and means to pass the sepa= rated .zones of said current:

.In testimony whereof I have afiixed my signature in presence of two witnesses.

BRENnEL,- osKAR.

HANS MUMMLER, HANS UnHMAn 

